Ikkaku Madarame is the 3rd Seat of the 11th Division in the Gotei 13. His captain is Kenpachi Zaraki.

In terms of his attitude, Ikkaku is a stereotypical 11th Division member—violent, fight-loving, and rude. This has been noted by Tetsuzaemon Iba, among others. He loves fighting so much that he is unwilling to travel anywhere without a sword, resorting to carrying a wooden one when posing as a student at Ichigo Kurosaki's school; however, Ikkaku does have a sense of loyalty and responsibility unlike many of the lower-ranked 11th Division members and is fiercely loyal to his captain, under whose command he wishes to die.

Ikkaku shares many personality traits with his division's captain, Kenpachi Zaraki, which explains why they seem to have so much respect for each another. Ikkaku considers fighting fun, just as his captain does, and tries to get as much fun as he can out of his opponents, so much so that he would take deadly risks to drag out the fight for as long as possible. He also shares Kenpachi's penchant for limiting his skills in order for fights to last longer (with the only difference being the fact that he chooses to do so by restricting the use of his Bankai whereas Kenpachi prefers the use of his power-sealing eye patch given to him by the 12th Division). Like Kenpachi, Ikkaku is seen constantly smiling when engaging in a fight with a formidable opponent. And like all 11th Division members, he considers the only honorable battles to be those that are fought one-on-one. Even the threat of death is not a reason to ignore this fact, as they believe that the winner is only to be determined when the other dies. He does consider surviving an otherwise lost battle good luck, as his captain taught him, and is also sensible enough to carry a blood-clotting ointment in the hilt of his Zanpakutō. Unique to him, though, is a rather wacky quality made famous by his "Lucky Dance."